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Goodwill and Other Intangible Assets - Schedule of Future Estimated Amortization of Intangibles (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2017 $ 203,845
2018 200,021
2019 186,792
2020 167,136
2021 163,586
Thereafter $ 1,220,901